{"id":522,"date":"2016-05-05T07:14:06","date_gmt":"2016-05-05T05:14:06","guid":{"rendered":"http:\/\/fusion.bsc.es\/?p=522"},"modified":"2016-10-21T10:03:31","modified_gmt":"2016-10-21T08:03:31","slug":"progress-in-bootstrap-current-theory","status":"publish","type":"post","link":"https:\/\/fusion.bsc.es\/index.php\/2016\/05\/05\/progress-in-bootstrap-current-theory\/","title":{"rendered":"Progress in bootstrap current theory"},"content":{"rendered":"<figure style=\"width: 325px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/iter.rma.ac.be\/images\/banana_stretch.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"scaled\" src=\"http:\/\/iter.rma.ac.be\/images\/banana_stretch.jpg\" width=\"335\" height=\"450\" border=\"2\" \/><\/a><figcaption class=\"wp-caption-text\">Orbits of a passing (red) and a trapped (blue) particle.<\/figcaption><\/figure>\n<p style=\"text-align: justify;\">Using an advanced plasma global code called <b><a href=\"http:\/\/epsi.pppl.gov\/computing\/xgca\">XGCa<\/a><\/b>, researchers at the Princeton Plasma Physics Laboratory (PPPL) have\u00a0confronted the conventional\u00a0view of the so-called\u00a0bootstrap current with results clarifying\u00a0the origin of\u00a0the current at the tokamak edge.<\/p>\n<p><!--more--><\/p>\n<p style=\"text-align: justify;\">According to their recent study, the bootstrap current is a neoclassical current that arises from collisions between magnetically trapped particles, in the so-called banana orbits, and passing particles, due to the toroidal geometry. It is directly connected with the helical shape of the magnetic field that confines the plasma in a tokamak.<\/p>\n<p style=\"text-align: justify;\">In the past, physicists considered that passing electrons carried the current alone.<\/p>\n<p style=\"text-align: justify;\">The discovery\u00a0is of importance because\u00a0<b>the bootstrap current\u00a0is a key factor in the understanding of instabilities generation at the plasma edge pedestal<\/b>, i.e. the steep gradient region of the plasma edge.<\/p>\n<p style=\"text-align: justify;\"><em>\u201cCorrect modeling of the current enables accurate prediction of the instabilities\u201d<\/em> affirmed Hager, main author of the <a href=\"http:\/\/scitation.aip.org\/content\/aip\/journal\/pop\/23\/4\/10.1063\/1.4945615\">paper<\/a>.<\/p>\n<p style=\"text-align: justify;\">More information can be found <a href=\"http:\/\/www.pppl.gov\/news\/2016\/05\/scientists-challenge-conventional-wisdom-improve-predictions-bootstrap-current-edge\"><b>here<\/b><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Using an advanced plasma global code called XGCa, researchers at the Princeton Plasma Physics Laboratory (PPPL) have\u00a0confronted the conventional\u00a0view of the so-called\u00a0bootstrap current with results clarifying\u00a0the origin of\u00a0the current at the tokamak edge.<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-522","post","type-post","status-publish","format-standard","hentry","category-world"],"_links":{"self":[{"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/posts\/522","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/comments?post=522"}],"version-history":[{"count":9,"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/posts\/522\/revisions"}],"predecessor-version":[{"id":530,"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/posts\/522\/revisions\/530"}],"wp:attachment":[{"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/media?parent=522"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/categories?post=522"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fusion.bsc.es\/index.php\/wp-json\/wp\/v2\/tags?post=522"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}